Signal Consulting, LLC 

Model Si5SDAFT1-120V-20A 

Single, 120V 20A Solenoid Driver with Adjustable Fast Timer, Integrated Heat Sink, T-Chip





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 Si5SDAFT1-120V-20A Features:
Power Semiconductors: One 90A MOSFET
Max. Continuous Current: 20A with Heat Sink Plate (as Shown)
Max. Current 5 Sec: 40A with Proper Heat-sinks Installed
Overall Dimensions: 4.0" x 3.3" x 1.4" (102 x 84 x36mm).
Components Type: 100% Solid State, NO Relays

 Load-Voltage rise and Fall-time: Approximately 7 micro Sec (10% to 90% load-levels).

  A single Coil or Load is controlled  by an adjustable Timer.

  User selectable Initially-High or Initially-Low Coil-Current States.

  User can choose between One-Shot mode or Periodic mode of operation.

 Adjustable Pulse Width : from 1 to 128 ms in 0.5ms steps.

 Adjustable Pulse-Period: from 1ms to 256ms in 1ms steps.

High Power-Efficiency: 95.5% typical, at 120V and 20A

Scope Output Port: A 0 to +5V output signal is provided to monitor and time the coil action.

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated) with any voltage value from 30V to 120V (for Vp)




 Si5SDAFT1-120V-20A-7T,  Spec Sheet  (PDF)

The Si5SDAFT1-120V-20A is a single, 120V 20A, Solenoid Driver with an integrated heat sink that uses a microprocessor based adjustable timer to fully turn on or off the current in an inductive load. This board requires a single 30V to 120V DC power source (unregulated and unfiltered) at a 0A to 20A current range to operate normally with a wide range of inductive loads (coils or Solenoids). Snubbing circuits and filter capacitors are included to suppress inductive switching transients. An onboard LED (red) is used to monitor the load-voltage. The onboard timer can operate in two user-selectable modes (selected by a jumper, labeled as CN3). In the One-Shot Mode (with CN3 Open), each positive voltage edge (0 to +5V transition at pin I1 relative to pin G at CN5) produces a coil-current pulse. The pulse width is adjustable from 2 to 200 milliseconds using an on-board 25-turn potentiometer labeled as P2. In the Periodic Mode (with CN3 Short), the coil pulses are periodically generated as long as the input voltage at pin I1, relative to pin G, at CN5 is greater than +2.5V. The pulse width is adjustable from 1ms to 128ms in 0.5ms steps using an on-board 25-turn potentiometer (P2); while the time-delay between pulses is adjustable from 1ms to 128ms in 1ms steps using a second 25-turn potentiometer (P1).The initial value of the load current is also user selectable by a second jumper (labeled as J1). If the jumper J1 is open, then the initial load current is fully on (or the initial load current is maximum) before a valid positive edge or level has arrived at the control input (pin I1). If the jumper J1 is short, then the initial load current is fully off (or the initial load current is zero) before a valid positive edge or level has arrived at the control input (pin I1). The control input (I1) requires 0 to 5V voltage levels to operate properly. This input is zener-diode protected and can withstand severe overloads.

Both of these jumpers are examined only at power turn-on; consequently, the power must be turned on and off whenever these jumpers are reconfigured.

A small (4.0”x3.3”x0.0.062”) Aluminum Plate (integrated heat sink) is included with mounting hardware (as shown on the photograph) to operate at 20A or 2400W power levels. Higher power-levels (120V, 30A or 3600W) can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. Typical applications are: Inductive-Plunger Driver, SPST Solid State Relay, etc. This board can be configured to perform efficiently in many customized applications.

A Typical Application of the Si5SDAFT1-120V-20A

In this One-Shot Mode and High Initial-Current State application, a 20A at 120V inductive load (coil or solenoid) is turned on and off by the digital control voltage VI1,G. The load current is fully on (max) when 0< VI1,G <2.5V; and the load current is Pulsed to zero when 2.5V< VI1,G<5V and VI1,G has a positive edge.  An inexpensive, unregulated DC power supply design is shown in this application drawing. This power supply consists of a transformer, a 25A bridge rectifier and an optional capacitor (C=2000uF, 150V).  A wide variety of linear and switching power supplies can, also, be used with this board. Consult the most recent catalog on to purchase these power supplies.


 Warning:  The connecting wires to the Motor and the Power Supply must be heavy gage copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gage wires act as a heat sink, protecting the board from overheating.

Si5SDAFT1-120V-20A , Single, Solenoid Driver with Adjustable Fast Timer and Heat Sink, 1 DC Load at 120V, 20A 
Price $239.00

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Availability: We usually ship in 2-3 business days.



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